Lock.



.l. T. WARNE.

LOCK.

APPLICATION FILED 001.24. m1.

1 ,274,477 Patented Aug. 6, 1918.

Ami-ma.

UNITED STATES PATENT OFFICE.

JOHN THOMAS wAnNE, or BURNABY, BRITISH COLUMBI CANADA.

, LOCK.

To all IO/(107M it may concern Be it known that I, Join: TuoMAs lVAnNn,a subject of the King of Great Britain, and a resident of themunicipality of Burnaby, in the Province of British Columbia, Canada,have invented certain new and useful Improvements in Locks, of which thefollowing is a specification.

My invention relates to improvements in locks, and the object of myinvention is to provide a lock having means incorporated therewith forlocking the lock bolt against unauthorizedretraction so that it cannotbe readily opened except with the proper key provided for it, and whichlock is.simple in construction and eflicient in operation.

I attain this object by the construction illustrated in the accompanyingdrawings in which- Fi'gure 1 is a view of the interior of the lock.

Fig. 2 is a cross section taken on the line a-b of Fig. 1.

Similar figures of reference indicate similar parts throughout theseveral views.

1 indicates the lock casing having a removable side plate 2 and providedwith a keyhole 3, adjacent to which keyhole is arranged a similarconstruction to that found in locks in present use, such constructionbeing indicated generally at 4 in Fig. 1 and consisting of the usualelements cooperating with the wards of the key bit with which the lockis supplied to prevent the turning in the lock of any but the properkey, in fact, the lock casing, with its key and tumbler arrangement maybe made substantially the same as that of any well-known lockconstruction.

5 indicates the locking belt, which is slidably mounted for longitudinalmovement in the casing, being shown in the projected locking position inFig. 1. The belt 5 is provided on its upper edge with a plurality ofrearwardly facing notches 6 and on its lower edge with a plurality ofteeth 7, with which teeth engages normally a pinion 8, which pinion ismounted on and secured to the transverse rotatable shaft 9, this shaftbeing provided with the usual door knobs 10 on each end and rotatedthereby, one knob only being shown, in Fig. 2, and indicated dotted inFig. 1, from which it will be seen that the lock bolt 5 may be projectedand retracted to lock or unlock the door by turning knob 10 in therequired Specification of Letters l atont.

' l.atei1ted Aug. 6, 1918.

Application filed October 24, 1917. Serial No. 198,306.

direction, the projecting ol the bolt, however, being etl'ected withoutthe necessity ol? turning the knob by means of a spring 11, which springis disposed between the inner 'end of the bolt and the end plate of theeasing 1 and'is compressed by the bolt when retracted. 12 and 13indicate slotsformed in the bolt 5 and cooperating with suitably securedpins 1% and 15, by means of which the bolt is guided in its longitudinaltravel.

In order to prevent unauthorized opening of thelock a pawl 16 isprovided, which pawl is fulcrumed as at 17, the long end 18 normallyengaging one of the notches 6 when the bolt is projected into thelocking position, its short end 19 extending adjacent the keyhole anddisposed in the path of the key bit so that it may be contacted therebyas it is turned in the lock, in either direction. 20 and 21 indicatespring members arranged to form a pair of spring jaws directly above thelong end of the pawl, between which jaws the pawl is held clear ofcontact with the bolt when the same is to be retracted. 22 indicates thekey, the bit of which is shown engaging the short end 19 and on thepoint of raising the long end 18 clear of the notch with which it isengaged.

The operation of my device will be apparent. Assuming that the parts areas shown in Fig. 1, the bolt being out and in the locking position, itwill be seen that the bolt is held against inward movement by theengagement of the pawl 16 with the notch 6 and that no movement of theknob 10 can move the bolt until the pawl is raised clear of the same,therefore, in order to allow the bolt to be retracted it is necessary toinsert the key, which must necessarily be the proper one, in thekeyhole, and turn it in the direction of the arrow until the bit of thekey contacts with, and bears down, the short end 19 ot' the pawl, thusraising the long end 18 and forcing it up between the spring jaws formedby the members 20 and 21, between which it is held clear of the It willbe seen, therefore, that I have demampulatlon.

What I claim as my invention is: p 1. In a look, the combination with acasing having a key hole, of a key bit, a sliding a bolt having upperedge notches and lower edge teeth, an independent pawl pivoted 7 offcenter located between the bolt and key bit having its long end normallycoacting with said notches and its short end disposed to be contacted bythe key bit'so as to raise or lower the notch eng ging end, and a pinionengaging the said teeth by the rotation of which the bolt'may beprojected or retracted.

' 2. In a lock, the combination with a casing having a keyhole,o'f asliding bolt having upper edge notches and lower edge teeth, a suitablyfulcrumed pawl having one end co-acting with the said notches and itsother end disposed to be contacted by the key-:bit so as to raise orlower. the notch-engaging end, springl'aw's between which'thenotchengagingen ,i s forced when raised, and a pinion engaging the saidteeth by the rota tion of which the bolt may be projected or retracted.

3. In a lock, the combination with a casing having a key hole, of asliding bolt mounted for projection or retraction and provided withupper edge notclis,- and a straight pawl suitably fulcrumed intermediateof its length having its long end coacting with said notches anditsshortend disposed to lie in the path of the key bit so that the,notch engaging end may be raised or lowered by direct contact of the keybit with the short end.

' 4,. In a lock, the combination with .a casing having. a keyhole, of asliding bolt mounted for projection or retraction "and provided withupper edge notches, and a suitably fnlcrumed pawl having one end 00-acting with the said notches and itsother end disposed to lieginthe pathof the key bit, so that the notch engaging end maybe raised orlowered bydirect contact therewith.

Oct.,1-917. g

. JOHN THOMAS WARNE.

Copies of this patent "may beblitai'ii'e' dfor fiw cents each, byaddressing the Commissioner of iatena.

' i WaisliiingtbiyDiC.

Dated at Edmonds, '13- 0., this {lth day df

